PPC: [turbofan] Prevent storing signalling NaNs into holey double arrays.

src/compiler/ppc/code-generator-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 1333 matching lines @@
 #if V8_TARGET_ARCH_PPC64
     case kPPC_Tst64:
       if (HasRegisterInput(instr, 1)) {
         __ and_(r0, i.InputRegister(0), i.InputRegister(1), i.OutputRCBit());
       } else {
         __ andi(r0, i.InputRegister(0), i.InputImmediate(1));
       }
       DCHECK_EQ(SetRC, i.OutputRCBit());
       break;
 #endif
+    case kPPC_Float64SilenceNaN: {
+      DoubleRegister value = i.InputDoubleRegister(0);
+      DoubleRegister result = i.OutputDoubleRegister();
+      __ CanonicalizeNaN(result, value);
+      break;
+    }
     case kPPC_Push:
       if (instr->InputAt(0)->IsFPRegister()) {
         __ stfdu(i.InputDoubleRegister(0), MemOperand(sp, -kDoubleSize));
         frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
       } else {
         __ Push(i.InputRegister(0));
         frame_access_state()->IncreaseSPDelta(1);
       }
       DCHECK_EQ(LeaveRC, i.OutputRCBit());
       break;
@@ skipping 820 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8